Tracking of a Target in a Wireless Communication Network

1. A method performed by a network equipment configured for use in a wireless communication network, the method comprising: receiving, over an interface with radio equipment, a request for information based on which is determinable an unobfuscated identifier associated with a target being tracked by the radio equipment, wherein the unobfuscated identifier is obfuscated by an obfuscating identifier associated with the target, and wherein the radio equipment is a radio equipment of a law enforcement agency and the radio equipment is authorized and/or authenticated by the wireless communication network; and sending, from the network equipment to the radio equipment, a response that includes the requested information.

2. A network equipment configured for use in a wireless communication network, the network equipment comprising: communication circuitry; and processing circuitry configured to: receive, over an interface with radio equipment, a request for information based on which is determinable an unobfuscated identifier associated with a target tracked by the radio equipment, wherein the unobfuscated identifier is obfuscated by an obfuscating identifier associated with the target and wherein the radio equipment is a radio equipment of a law enforcement agency and the radio equipment is authorized and/or authenticated by the wireless communication network; and send, from the network equipment to the radio equipment, a response that includes the requested information.

3. The network equipment of claim 2, wherein the request includes obfuscating identifiers that the radio equipment detects as being transmitted over-the-air as the radio equipment tracks the target over time, wherein each obfuscating identifier obfuscates a respective unobfuscated identifier.

4. The network equipment of claim 3, wherein each obfuscating identifier comprises an encrypted version of the associated unobfuscated identifier or a temporary identifier whose association with a respective unobfuscated identifier is only temporary.

5. The network equipment of claim 3, wherein each obfuscating identifier is a Subscription Concealed Identifier (SUCI).

6. The network equipment of claim 2, wherein the request indicates where and when the target has been or will be tracked by the radio equipment.

7. The network equipment of claim 2, wherein the unobfuscated identifier associated with the target is a Subscription Permanent Identifier (SUPI) or a Permanent Equipment Identifier (PEI) or an International Mobile Subscriber Identity (IMSI) or an International Mobile Equipment Identifier (IMEI).

8. The network equipment of claim 2, wherein the network equipment implements at least a Unified Data Management (UDM) function or a Subscription Identifier Deconcealing Function (SIDF) or the network equipment implements at least a Lawful Intercept Administration Function (ADMF) or the network equipment implements at least a Mediation Function 2 (MF2).

9. The network equipment of claim 2, wherein the interface is an interface configured for real time communication.

10. A method performed by radio equipment for tracking a target, the radio equipment being a radio equipment of a law enforcement agency, the method comprising: sending, over an interface to network equipment in a wireless communication network, a request for information based on which is determinable an unobfuscated identifier associated with the target, wherein the unobfuscated identifier is obfuscated by an obfuscating identifier associated with the target and the radio equipment is authorized and/or authenticated by the wireless communication network; and receiving, from the network equipment, a response that comprises the requested information.

11. Radio equipment, the radio equipment being a radio equipment of a law enforcement agency, the radio equipment comprising: radio frequency circuitry; and processing circuitry configured to: send, over an interface to network equipment in a wireless communication network, a request for information based on which is determinable an unobfuscated identifier associated with a target tracked by the radio equipment, wherein the unobfuscated identifier is obfuscated by an obfuscating identifier associated with the target and the radio equipment is authorized and/or authenticated by the wireless communication network; and receive, from the network equipment, a response that includes the requested information.

12. The radio equipment of claim 11, wherein the processing circuitry is further configured to detect obfuscating identifiers transmitted over-the-air as the radio equipment tracks the target over time, wherein each obfuscating identifier obfuscates a respective unobfuscated identifier, and wherein the request includes the obfuscating identifiers detected.

13. The radio equipment of claim 12, wherein the processing circuitry is configured to detect obfuscating identifiers transmitted over-the-air by: simulating radio network equipment of the wireless communication network, and requesting and receiving the obfuscating identifiers from respective wireless devices that are attempting to attach to the radio network equipment or perform location updates; or passively monitoring for obfuscating identifiers transmitted in location update messages or paging messages.

14. The radio equipment of claim 11, wherein the request indicates where and when the target has been or will be tracked by the radio equipment.

15. The radio equipment of claim 14, wherein a timestamp in the request indicates when the target has been or will be tracked by the radio equipment and wherein geographical coordinates in the request indicate where the target has been or will be tracked by the radio equipment or indicate a geographical location of the radio equipment.

16. The radio equipment of claim 11, wherein the requested information included in the response comprises the unobfuscated identifier associated with the target.

17. The radio equipment of claim 12, wherein each obfuscating identifier comprises an encrypted version of the associated unobfuscated identifier or a temporary identifier whose association with a respective unobfuscated identifier is only temporary.

18. The radio equipment of claim 11, wherein the unobfuscated identifier associated with the target is a Subscription Permanent Identifier (SUPI) or a Permanent Equipment Identifier (PEI) or an International Mobile Subscriber Identity (IMSI) or an International Mobile Equipment Identifier (IMEI).

19. The radio equipment of claim 11, wherein the network equipment implements at least a Unified Data Management (UDM) function or a Subscription Identifier Deconcealing Function (SIDF) or the network equipment implements at least a Lawful Intercept Administration Function (ADMF) or the network equipment implements at least a Mediation Function 2 (MF2).

20. The radio equipment of claim 11, wherein the radio equipment is a cell site simulator, a false base station, or an IMSI catcher.